<!-- 因为源文件牵扯过多页面,无法修改,故新开文件 -->
<template>
  <div class="component-upload-image">
    <el-upload multiple :action="uploadImgUrl" :list-type="uploadType" :on-success="handleUploadSuccess"
      :before-upload="handleBeforeUpload" :limit="limit" :on-error="handleUploadError" drag :on-exceed="handleExceed"
      :http-request="uploadFile" ref="imageUpload" :on-remove="handleDelete" :show-file-list="true" :headers="headers"
      :file-list="fileList" :on-preview="handlePictureCardPreview"
      :class="{ hide: this.fileList.length >= this.limit }">
      <i v-if="uploadType === 'picture-card'" class="el-icon-plus"></i>
      <el-button v-else>上传文件</el-button>
    </el-upload>

    <!-- 上传提示 -->
    <div class="el-upload__tip" slot="tip" v-if="showTip">
      请上传
      <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b> </template>
      <template v-if="fileType"> 格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b> </template>
      的文件
    </div>

    <el-dialog :visible.sync="dialogVisible" title="预览" width="800" append-to-body>
      <img :src="dialogImageUrl" style="display: block; max-width: 100%; margin: 0 auto" />
    </el-dialog>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";

import { deleteFileFromOss, ossSignURL, sendFileToOSS } from "../../api/file"

export default {
  props: {
    value: [String, Object, Array],
    // 图片数量限制
    limit: {
      type: Number,
      default: 5,
    },
    /**
     * 删除回调name
     */
    deleteCallbackName: {
      type: String,
      default: "input",
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 20,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["png", "jpg", "jpeg"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    },
    ossURL: {
      type: String,
      default: "/oss/uploadPicEmpower"
    },
    uploadType: {
      type: String,
      default: 'picture-card'
    }
  },
  data() {
    return {
      objectName: undefined,
      number: 0,
      uploadList: [],
      dialogImageUrl: "",
      dialogVisible: false,
      hideUpload: false,
      baseUrl: process.env.VUE_APP_BASE_API,
      uploadImgUrl: "", // 上传的图片服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: []
    };
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : val.split(',');
          // 然后将数组转为对象数组
          this.fileList = list.map(item => {
            if (typeof item === "string") {
              item = { name: this.getFileName(item), url: item, size: null };
            }
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true
    },
    ossURL: {
      handler(val) {
        this.uploadImgUrl = val;
        console.log("this.uploadImgUrl", this.uploadImgUrl);
      },
      immediate: true
    }
  },

  created() {
  },

  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {

    // 文件链接截取文件名
    getFileName(url) {
      return url.substring(url.lastIndexOf('/') + 1);
    },

    /**
     * 
     * @param {{
     * file: File,
     * action: String,
     * header: {
     *  Authorization: String
     * }
     * }} data 
     */
    uploadFile(data) {

      let file = data.file;

      data.onProgress(file);

      ossSignURL({
        fileName: file.name,
        type: file.type
      }, this).then(res => {

        console.log("file.name", this.objectName);
        let fileNew = new File([file], this.objectName);

        sendFileToOSS(res.data, fileNew, this).then(result => {
          data.onSuccess(res, fileNew);
        });


      }).catch(e => {
        console.error(e);
        data.onError(file);
      });
    },

    // 上传前loading加载
    handleBeforeUpload(file) {
      let isImg = true;
      if (this.fileType.length) {
        let fileExtension = "";
        if (file.name.lastIndexOf(".") > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf(".") + 1);
        }
        isImg = this.fileType.some(type => {
          if (file.type.indexOf(type) > -1) return true;
          if (fileExtension && fileExtension.indexOf(type) > -1) return true;
          return false;
        });
      }

      if (!isImg) {
        this.$modal.msgError(`文件格式不正确, 请上传${this.fileType.join("/")}图片格式文件!`);
        return false;
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$modal.msgError(`上传头像图片大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      this.$modal.loading("正在上传，请稍候...");
      this.number++;
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      if (res.code === 200) {
        console.log("handleUploadSuccess", res.data);

        let url = res.data.url.substr(0, res.data.url.indexOf("?"));

        console.log("handleUploadSuccess", res.data);


        this.uploadList.push({ name: file.name, url: url, size: file.size });
        this.dialogImageUrl = res.data;
        this.uploadedSuccessfully();
      } else {
        this.number--;
        this.$modal.closeLoading();
        this.$modal.msgError(res.msg);
        this.$refs.imageUpload.handleRemove(file);
        this.uploadedSuccessfully();
      }
    },
    // 删除图片
    /**
     * 
     * @param {File} file 
     */
    handleDelete(file) {


      const findex = this.fileList.map(f => f.name).indexOf(file.name);
      if (findex > -1) {
        this.fileList.splice(findex, 1);
        this.$emit(this.deleteCallbackName, this.listToString(this.fileList));
        this.$emit("fileListChange", this.formatData(this.fileList))
      }
      if (!file || !file.url) return;
      // 删除 oss 图片
      deleteFileFromOss(file.url)

    },
    // 上传失败
    handleUploadError() {
      this.$modal.msgError("上传图片失败，请重试");
      this.$modal.closeLoading();
    },
    // 上传结束处理
    uploadedSuccessfully() {

      if (this.number > 0 && this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList);
        console.log("FileList: ", this.fileList);
        this.uploadList = [];
        this.number = 0;

        this.$emit("input", this.fileList);
        this.$emit("fileListChange", this.formatData(this.fileList))
        this.$emit("uploadInfos", this.fileList);
        this.$modal.closeLoading();
      }
    },
    //格式化数据
    formatData(data) {
      if (!data || !data.length) return [];
      let list = [...data]
      list = list.map(item => {
        return {
          file: item.url || item.file || '',
          originName: item.name || item.originName || '',
          size: item.size || ''
        }
      });
      return list
    },
    // 预览
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url;
      this.dialogVisible = true;
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        if (list[i].url) {
          strs += list[i].url.replace(this.baseUrl, "") + separator;
        }
      }
      return strs != '' ? strs.substr(0, strs.length - 1) : '';
    }
  }
};
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}

// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}

::v-deep .el-upload-list__item {
  padding: 10px 0;
  background-color: rgba(224, 224, 224, 0.6);
}

::v-deep .el-upload-list__item-status-label,
::v-deep .el-icon-close {
  top: 50%;
  transform: translateY(-50%);
}
</style>